He prefers Flare-brand match smoke for purifier testing. We’ve changed our picks to low-air-resistance MERV 13 filters that deliver top performance without straining your HVAC system.

April 15, 2025 /PRNewswire/ -- Filtrete ... The kit includes Filtrete™ MPR 1550 (MERV 12) Refillable Air Filters, which capture 42 percent more microparticles (0.3-1 microns) than the industry ...